You really think 3000$ to some random dude on the internet,paid upfront, no forum rep, just wants you to send him money, no proof of any files, anything working is legit?
If you want a customized solution it will cost you at least that much if not more, but if you want something simple you can start with a 2000-3000USD range, and keep adding more functionality or other extras as you grow. You should also spend much more in marketing.